Uploading a pdf file to sql database and converting to a byte before uploading - Asp.net c#

protected void btnSubmit_Click(object sender, EventArgs e)
    {
        string caseNumber = txtCaseNumber.Text;
        string documentName = txtDocName.Text;
        string category = DropDownListCat.SelectedItem.ToString();
        string state = DropDownListState.SelectedItem.ToString();
        //string strFileName = upFile.FileName;
          
        
        if (upFile.HasFile)
        {
            if (checkFileType(upFile.FileName))
            {
                if (checkFileType(upFile.FileName))
                writeToDbDocInfor(caseNumber,documentName,category,state,strFileName);
            }
            else
            {
                lblwrongfile.Text = "This file is not a pdf file";
            }
        }
        
    }
 
 
 
 
private int writeToDbDocInfor(string caseNumber, string documentName, string category, string state, string strFileName)
    {
        docInformation dcinfo = new docInformation();
        int result = dcinfo.writeDocInforToDb(caseNumber, documentName, category, state, strFileName);
        return result;
 
    }
 
 
 
 
 
// Read the file and convert it to Byte Array 
//sample code on how to convert pdf file to byte
string filePath = Server.MapPath("APP_DATA/TestDoc.docx"); 
string filename = Path.GetFileName(filePath); 
FileStream fs = new FileStream(filePath, FileMode.Open, FileAccess.Read); 
BinaryReader br = new BinaryReader(fs); 
Byte[] bytes = br.ReadBytes((Int32)fs.Length); 
br.Close(); 
fs.Close();